obama was deeply affected by that, and started to adopt as innocent as one of his primary causes. he also worked with republican senator chuck hagel to fashion some of the most comprehensive nonproliferation legislation ever presented in the u.s. senate. and that relationship as you can see continues today with secretary hagel being his secretary -- with senator hagel being his secretary of defense and richard lugar still a close confidant to the president. in fact, president obama focused on nuclear policy in his very first national security address in prague in april 2009. and there he laid out the vision of a world without nuclear weapons. the idea that we should move step by step to eliminate these weapons, and he married that vision up with a series of practical measures to address the various aspects of the nuclear threat. the first with two i mentioned. he said we have to redouble our efforts to secure all nuclear materials around the world. the good news is that a terrorist can build a nuclear weapon from scratch. they don't have the facility, the infrastructure to build t